JP6061483B2 - Cooling seat and neck cooler - Google Patents

Description

  The present invention relates to a cooling sheet and a neck cooler, and more particularly to a cooling base material, a cooling sheet, and a neck cooler for cooling an object in an energy-saving manner.

  Conventionally, a cooling method mainly using adiabatic compression / expansion of gas has been adopted for cooling an object, but this requires a lot of electric power and other energy, and the apparatus is complicated.

  In recent years, global warming due to greenhouse gases has become prominent, especially in summer, when hot days continue, and it is impossible to live without the use of cooling equipment. And as for the cooling apparatus currently employ | adopted, the kind of apparatus using the endothermic effect by adiabatic compression expansion of a certain kind of gas has become mainstream. However, these devices require electric power for compression, the device is complicated and expensive, the weight of the entire device is large, and it is difficult to say that it is easy and energy saving. For society as a whole, large consumption of electricity leads to a large amount of greenhouse gas emissions and falls into a vicious circle.

Accordingly, there is a social need for a slightly more convenient and energy-saving cooling method. The present invention aims to solve this problem.

  Conventionally, there has been an idea to cool the water inside by using the latent heat of evaporation when the water inside exudes in an unglazed bottle or the like having fine voids, but these materials are extremely hard and Since it lacks flexibility, it is not suitable for a cooling sheet that cools a large area.

Moreover, there exists patent document 1 as a prior art. This prior art invention is an energy saving cooling method in which a water-absorbing polymer is filled into a packaging material composed of a sheet made of a breathable material on the front side and a synthetic resin sheet on the back side to form a cooler mat. is there.
Synthetic polymer absorbents such as sodium polyacrylate are known as water absorbents to be used. However, when these materials are used, the water expansion phenomenon is remarkable and the physical properties of the film as a packaging material are deteriorated. There is a major drawback. It is also known that the ability to diffuse water is not as much as expected.

Japanese Patent Laid-Open No. 11-028034

The present invention provides an easy and energy-saving cooling method, and provides a cooling technique that is not only excellent in efficiency but also flexible and capable of sufficiently responding to cooling of a large area. It is intended.

The first gist of the present invention relates to a cooling substrate for water diffusion, and is a group characterized in that fine polymer silica having a specific surface area of 150 to 380 m ² / g and a liquid softening agent are blended in a polymer. It is a material. And these compounding ratios use 30 to 150 parts of fine powder silica and 50 to 200 parts of liquid softener for 100 parts by weight of the polymer.

Specifically, the polymer is a nonpolar rubber, and the amount of fine powder silica is preferably 70 to 120 parts, and the amount of the liquid softening material is preferably 70 to 170 parts.

The substrate can be used as a cooling sheet in this state, for example, by immersing the substrate in water to attach water to the surface of the substrate. And when it aims at cooling for a long time, the 2nd of this invention is preferable.
The second gist of the present invention is characterized in that all or a part of the periphery of the water chamber filled with water is constituted by the water diffusion film comprising the first water diffusion cooling base material of the present invention. It is a cooling sheet.

  Specifically, the water diffusion film is a cooling sheet lined with cloth, and the surface of the water diffusion film that contacts the water in the water chamber is lined with a porous polymer sheet that melts at a temperature of 300 ° C. or lower. It has been done. In addition, the water chamber may cover a part of the periphery thereof with a water-impermeable film such as a polyethylene film or a polyvinyl chloride film, or may be attached with a device for blowing air on the surface.

The water diffusion cooling base material (water diffusion film) according to the first aspect of the present invention is a flexible, uniform and transparent film and is therefore suitable for cooling an object having a large area. Furthermore, since there are no fine voids in the substrate (film) and there is no air permeability, there is no concern about water leakage unless trauma occurs.
The water diffusing power is very large. Therefore, in the cooling sheet according to the second aspect of the invention, only the amount of water necessary for evaporation is automatically supplied, so that wasteful use of water is avoided. can avoid. Furthermore, since only a natural force called a diffusing force is used as the driving force, no electric power used in the adiabatic compression / expansion cooling method is required. Therefore, it can be said that the cooling method of the present invention is a resource-saving energy-saving cooling method.

FIG. 1 is a cross-sectional view of one embodiment of the second cooling sheet of the present invention. FIG. 2 shows a detachable neck cooler to which the second cooling sheet of the present invention is applied. FIG. 3 shows a built-in neck cooler to which the second cooling sheet of the present invention is applied. FIG. 4 shows the evaluation results of Example 7. FIG. 5 shows the evaluation results of the cooling performance in Example 8. FIG. 6 is a schematic diagram of an experimental method in Example 9. FIG. 7 shows the evaluation results of the moisture permeation amount in Example 9. FIG. 8 shows the tubular water diffusion cooling base material produced in Example 10.

In the following, the first aspect of the present invention will be mainly described, but a cooling method using a phenomenon that takes away the surrounding heat when the water passing through the water diffusion film evaporates has been completed. When water evaporates, latent heat of vaporization or vaporization is obtained. It is well known that a certain amount of heat called heat is required. However, the base material represented by the unglazed bottle as described above is not suitable for a cooling sheet for cooling a large area because it is hard and lacks flexibility. On the other hand, the water diffusion cooling base material (water diffusion film) according to the first aspect of the present invention is a flexible, uniform and transparent film, and is therefore suitable for cooling an object having a large area. Furthermore, since there are no fine voids in the substrate (film) and there is no air permeability, there is no concern about water leakage unless trauma occurs.

Here, the driving force when water diffuses through the base material (diffusion membrane) is referred to as diffusive force. However, the diffusive force in the base material of the first invention is very large, and in some cases, it rarely reaches 1000 atm or higher. is not. However, this diffusion force is determined by the difference between the water concentration in the inner film portion and the water concentration in the outer film portion, which is the evaporation surface, and increases as the concentration difference increases. Therefore, the amount of diffusion increases as the temperature of the environment rises and the evaporation becomes active. When the temperature decreases or the humidity rises, evaporation stagnates and the water concentration in the outer membrane portion increases and the amount of water diffusion decreases. In other words, in the first water diffusion cooling base material (water diffusion membrane) of the present invention, only the amount of water necessary for evaporation is automatically supplied, so that useless use of water can be avoided. And since only the natural force called a diffusive force is used for a driving force, there exists the big characteristic that the electric power currently used by the adiabatic compression expansion cooling method is not required at all. Therefore, it can be said that the cooling method of the present invention is a resource-saving / energy-saving cooling method.

The second invention efficiently uses this latent heat of vaporization to form a cooling sheet, and the principle of cooling is that the water chamber holding a certain amount of water is turned into a water diffusion film with a very large molecular diffusion amount of water. The heat of evaporation when the water in the water chamber evaporates near the surface of the membrane that diffuses and permeates through the diffusion membrane and contacts the outside air is used for cooling. On the basis of this principle, the structure is made into a sheet shape so that multi-area cooling can be performed.

Hereinafter, the present invention will be described in more detail. The water diffusion cooling base material (water diffusion film) is composed of three kinds of raw materials: fine powder silica having a specific surface area of 150 to 380 m ² / g, a polymer, and a liquid softening agent. . Finely divided silica (powder of silicon oxide) has a specific gravity of 1.95, the particle diameter 15～35Emumyu, is suitably used in the specification of the intake oil amount 160~300ml / 100g. Such silica is present in the diffusion film of the base material of the present invention and plays an important role as a medium for absorbing and transferring water. Synthetic polymer absorbents such as poly (sodium acrylate) are known as water absorbents, but it has already been mentioned that this is not preferable, but bentonite, montmorillonite, sepiolite, zeolite, etc. exist as inorganic water absorbents However, although water is absorbed, the ability to move water is much inferior to the fine powder silica of the present invention. The reason for this is not clear so far, but the ability of silica to diffuse water is outstanding.

  The amount of finely divided silica can be used in a ratio of 30 to 150 parts by weight per 100 parts of the polymer. If the number of parts of silica is small, the amount of water diffusion decreases, and if it is too large, the substrate (film) becomes stiff and the adhesive strength decreases, which is not preferable. Preferred is between 70 and 120 parts.

High molecular weight polymer is an important material that enhances the ability to form a base material (film), and it has no cross-linked structure, aggregated structure (hard segment) or crystal structure inside, and active free molecular motion is expected in high molecular weight molecular chains. Preferred is a polymer. If a cross-linked structure, an aggregated structure, or a crystal structure exists, the amount of water absorbed is reduced and the movement of water is suppressed. Examples of such a high molecular polymer include rubber and synthetic resin. The rubber includes natural rubber and synthetic rubber, and the synthetic rubber includes polystyrene butadiene rubber, polybutadiene rubber, polyacrylonitrile butadiene rubber, polychloroprene rubber, polyethylene propylene dienemer rubber, polyethylene propylene rubber, polyisobutylene isoprene rubber, fluorine rubber, etc. Various synthetic rubbers are used. In particular, synthetic rubbers generally called nonpolar rubbers such as polyethylene propylene dienemer rubber, polyethylene propylene rubber, polyisobutylene isoprene rubber and the like are preferable because of excellent weather resistance and aging resistance.

Next, the liquid softener will be described. Specifically, it refers to oil and plasticizer. Oil is generally used for blending rubber, and a liquid material called a plasticizer is blended with polyacrylonitrile butadiene rubber. Both are used for the purpose of softening polymers and improving their workability. The reason why the use of the liquid softening agent is important in the present invention is that it has a function of reducing the elastic modulus of the polymer itself and increasing the amount of water absorption to facilitate the diffusion movement of water. However, adding too much is not preferable because the physical properties of the substrate (film) are impaired. Aromatic, naphthenic and paraffinic oils are mainly used as rubber softeners. For softening the nonpolar rubber, it is preferable to use a paraffin having a specific gravity of 0.86 to 0.90 and a pour point of -15 to -18 ° C. Various types of plasticizers available on the general market can be used as the plasticizer. For example, dibutyl phthalate, dioctyl phthalate, di-2-ethylhexyl phthalate, dioctyl phthalate, dibutyl glycol adipate, dioctyl sebacate, dibutyl carbitol adipate, dioctyl sebacate, dibutyl sebacate, tricresyl phosphate, cresyl phenyl phosphate, adipic acid Plasticizer such as polyester.

The amount of the liquid softening agent is also used between 50 parts and 200 parts with respect to 100 parts of the polymer. If the amount is too small, the processability at the time of film production is deteriorated. If the amount is too large, the physical properties of the substrate (film) are lowered as described above. Preferred is between 70 and 170 parts.

In addition to the above three elements of finely divided silica, polymer, and liquid softener, other types of materials or chemicals can be used as long as the performance is not impaired depending on the purpose. These include, for example, ultraviolet absorbers, anti-aging agents, tackifiers, anticorrosive agents, antibacterial agents, color pigments, light shielding agents such as titanium oxide, fillers such as carbon black, calcium carbonate, and magnesium carbonate. .

An antibacterial and antifungal agent can be added to the water diffusion cooling base material (water diffusion film).
As the antibacterial and antifungal agent, known ones are applied, for example, amine, alcohol, aldehyde, amino acid, isothiazoline, isothiocyanate, imidazole, urea, ether, ester, chlorine. Oxazolidine, peroxide, carboxylic acid, carbanilide, carbamate, quinoline, oxide, sulfide, sulfamide, quaternary ammonium salt, thiazole, thiocarbamate, triazine, nitrile , Biguanides, hydantoins, pyridines, phenols, phthalimides, morpholines, iodines, amphoteric surfactants, and the like.
Among the antibacterial and antifungal agents, examples of water-soluble antifungal agents include 2-mercaptopyridine N-oxide sodium, and examples of water-insoluble antifungal agents include 2- (4-thiazolyl). ) Benzimidazole.
In place of the antibacterial and antifungal agent, hiba oil or the like having an antibacterial action may be used.
Among these, 2-mercaptopyridine N-oxide sodium, 2- (4-thiazolyl) benzimidazole and hiba oil are preferable, and 2-mercaptopyridine N-oxide sodium is more preferably used.
The content of the fungicide is preferably 0.01% by mass or more and 5% by mass or less, and more preferably 1% by mass with respect to the total mass of the water diffusion membrane.

Further, the water diffusion cooling base material (water diffusion film) may be used as a cooling sheet by, for example, immersing in water and attaching water to the surface of the base material. In addition, by covering the surface of the water diffusion cooling base material (water diffusion film) with a cloth or a water-absorbing structure, the water holding power of the base material may be increased and used as a cooling sheet.
Examples of the water-absorbing structure include a sheet (film) comprising / consisting of a water-absorbing polymer, a sheet (film) comprising / comprising a water-absorbing fiber, a sheet (film) comprising / consisting of a water-absorbing mineral, A sheet (film) containing / consisting of paper), a laminate of a plurality of the above sheets (films), a foam having water retention, and the like.
Examples of the water-absorbing polymer include polyacrylic acid, polyacrylate (such as sodium polyacrylate), sodium polyacrylate cross-linked body, polyvinyl alcohol, acrylic acid-vinyl alcohol copolymer, starch, starch-acrylic. Examples include acid copolymers, carboxymethyl cellulose, and modified polyalkylene oxides.

  Moreover, the cooling substrate for water diffusion (water diffusion film) may be formed in a tube shape. The tube-shaped cooling base for water diffusion (water diffusion membrane) can be used as a cooling cover for piping and the like.

  Next, the water chamber which is one of the components of the cooling sheet in the second aspect of the present invention will be described. The water chamber has an important function of storing and supplying water for evaporative cooling in the cooling sheet, and water is appropriately or constantly injected from the outside into the water chamber. And the periphery of the water chamber is surrounded by the base material (diffusion film) of the first invention, or a part of the periphery is constituted by this base material (diffusion film), and the other part is surrounded by the non-permeable film. Establish a water chamber. That is, when a space is provided between two base materials (diffusion membranes) in the first invention and the space is used as a water chamber, one base material (diffusion membrane) and another non-water-permeable membrane There is a case where a space is provided between them to be a water chamber. Of course, in any case, it is an essential requirement that water and the base material (diffusion film) are in contact with each other.

It is preferable to use a polyethylene film sheet or a polyvinyl chloride film sheet for the water-impermeable film. In the peripheral part of the water chamber, the base sheet (diffusion film) or the base material (diffusion film) and the water-impermeable film are bonded by heat fusion, double-sided adhesive tape, or other methods to produce a cooling sheet.

  If the size of one water chamber is made too large, the water chamber will not swell excessively when water is injected, so the size of the water chamber may be set to an appropriate size in consideration of the width of the entire sheet. It is also possible to create a water chamber group by connecting a plurality of water chambers with water channels. It is necessary to provide at least one inlet with a stopcock for each water chamber group. Water is supplied from this inlet at the start of use of the sheet, and the remaining water is discharged after use.

  In the cooling base for water diffusion according to the first invention, that is, the water diffusion film according to the second invention, the actually used film needs to maintain strength corresponding to the use conditions. For this reason, it is preferable to use various fabrics, that is, woven fabrics and nonwoven fabrics, laminated and reinforced on the evaporation surface or the inner surface of the water diffusion film. Woven fabrics and nonwoven fabrics should be strong enough to withstand the usage conditions for each application. For this, woven fabrics of natural fibers such as cotton, hemp, wool and silk, and woven fabrics or non-woven fabrics of synthetic fibers such as nylon, polyester, polyacryl and aromatic polyamide can be used. Although we were anxious about the decline in diffusion capacity by laminating woven fabrics and nonwoven fabrics, this was not the case and it was an acceptable reduction. Rather, the amount of diffusion often increases. This may be due to a substantial increase in the evaporation surface and water absorption by the fibers.

  In many cases, the water chamber is surrounded by two diffusion films, and the ends of the water chambers are heat-sealed together to prevent water leakage. In that case, although a high molecular weight polymer is used for the diffusion film, the strength is low because it is an amorphous polymer and is not crosslinked. For this reason, cracks may occur and breakage, particularly when stress concentrates on the joint of the film. Therefore, in order to prevent this, it is preferable that the outer surface of the diffusion film is bonded to a woven or non-woven fabric, and the inner surface is bonded to a polymer porous sheet that is thermally melted at a temperature of 300 ° C. or lower. Here, the term “porous” means that there are a large number of pores that are free to move water and do not hinder the diffusion of water, and refers to a woven fabric, a nonwoven fabric, a network, or the like of a hot-melt polymer. By doing so, the heat-meltable polymers are heat-melted and bonded to each other at the joint to form a strong joint, and the inner surface of the water chamber is protected by the porous polymer, so that a strong film is obtained.

  When the appropriately manufactured cooling sheet of the second invention was measured in an environment of 35 ° C. assuming a hot day, the surface temperature of the back side of the sheet was reduced to 29 ° C. Further, it was confirmed that the temperature difference increases because the amount of water evaporation increases as the environmental temperature rises. Moreover, since the consumption of water is very small and there is no water leakage, it has been found that it is possible to cool for a long time with one water supply, and the frequency of water supply is sufficient at a rate of about once a day.

  In the case of producing a large area water diffusion cooling base material (water diffusion film) used for a large area cooling sheet, for example, a calendar roll forming machine can be used. The molding temperature is appropriately determined according to the material used, and for example, 90 ° C. can be mentioned.

FIG. 1 shows a specific structure of the cooling sheet of the second invention, wherein 1 is two water diffusion films (base material of the first invention), and 2 is abutted and laminated on the outer surface of the film 1. It is canvas. 3 is a double-sided adhesive for integrating the end surfaces of the water diffusion films 2 and 2 to form a water chamber. Reference numeral 4 denotes a polyethylene thin tube having an outer diameter of 3 mm, which is a water supply port. 5 is a stopper, and 6 is a water chamber.

  In the cooling sheet of the second invention shown in FIG. 1, the water that has oozed out of the water chamber 6 through the diffusion film 1 evaporates into the atmosphere and diffuses into the air. Accordingly, a water vapor diffusion layer is formed in the air in contact with the cooling sheet. If this water vapor diffusion layer is wiped off by wind force, the water vapor density of the air in the vicinity of the cooling sheet is lowered and evaporation is promoted. As a result, the cooling effect is also promoted. Of course, it is possible to promote cooling by attaching a device (not shown) for blowing air to the surface of the cooling sheet.

The cooling sheet of the second invention can be applied to the neck cooler 10, for example, as shown in FIG. Specifically, the neck cooler 10 shown in FIGS. 2A and 2B is provided with an insertion portion for inserting the cooling sheet 12 in the central portion of the belt-shaped neck cooler main body 11, for example, A cartridge type cooling sheet is detachably inserted.
2A shows a state where the neck cooler body 11 and the cartridge type cooling sheet 12 are separated, and FIG. 2B shows a cartridge type cooling sheet 12 at the center of the neck cooler body 11. Is inserted and configured.
The cooling sheet according to the second aspect of the invention can be a neck cooler 10 with a built-in cooling sheet, for example, as shown in FIG. Specifically, the neck cooler 10 shown in FIG. 3 has a cooling sheet 12 integrated and incorporated in a central portion of a belt-like neck cooler main body 11, for example. In the neck cooler 10 shown in FIG. 3, the cooling sheet 12 is preferably integrated with the neck cooler 11 main body by an adhesive, heat fusion, or the like.

Hereinafter, the present invention will be described in more detail with reference to examples, but it goes without saying that the scope of the present invention is not limited to these examples.

Example 1
100 g of polyethylene propylene dienemer rubber (trade name JSREP57C) and 100 g of fine powder silica (trade name Nipsil VN-3) and 143 g of paraffinic oil were kneaded by two rolls to form a water diffusion film having a thickness of 0.5 mm. This film was pressure-bonded to a No. 11 canvas at a roll temperature of 120 ° C. using two rolls and laminated to prepare a sheet. Two rectangular sheets (laminated body of reference numerals 1 and 2) having a length of 12 cm and a width of 19.5 cm were cut out from the above sheet to form a cooling sheet template having the structure described in FIG. Acrylic resin-based double-sided adhesive tape 3 having a 1.5 cm wide and 0.08 mm thick nonwoven fabric as a support is attached to the periphery of this laminate, and the two sheets are laminated so that the surfaces of diffusion films 1 and 1 face each other. And pasted together. Accordingly, a rectangular water chamber 6 having a length of 9 cm and a width of 16.5 cm is formed.

About 50 g of water was poured into the cooling sheet through the polyethylene thin tube 4 shown in FIG. Next, this cooling sheet was left still in a constant temperature apparatus of 35 ° C. in which the circulation air volume was limited so as to be similar to the natural world. The surface temperature of the lower back surface of the cooling sheet reached an equilibrium at 26 ° C. after about 2 hours, and the surface temperature of the upper surface of the cooling sheet reached an equilibrium at 27.5 ° C. after about 4 hours.
Dividing the evaporation amount of water per unit time by the total area of the water chamber evaporation surface to obtain the mass flow rate of water, that is, the permeation rate, the value was 4.381 × 10 ⁻⁶ g / cm ² · sec. Further, the diffusion coefficient was 5.918 × 10 ⁻⁷ cm ² / sec. In addition, 4.78 g of water evaporates per hour in the entire cooling sheet. The surface temperature of the cooling sheet depends on the air volume inside the thermostat and is not an absolute evaluation of the cooling performance, but it is certain that the water has evaporated, and that amount is an evaluation value of the cooling sheet performance in that environment. It becomes. When the above evaporation rate is converted into an endothermic rate, 36.1 J / cm ² · sec is obtained. Further, the efficiency per area of the entire sheet is calculated to be 127.2 W / m ² , which is considered equivalent to absorbing the heat of the incandescent lamp of about 100 W per square meter of the cooling sheet of the second invention.

(Example 2)
When the cotton bleached cloth 2 was used in place of the canvas of Example 1, the water permeation rate was 4.829 × 10 ⁻⁶ g / cm ² · sec.

Example 3
When the polyester fabric 2 for work clothes was used instead of the canvas of Example 1, the water permeation rate was 6.232 × 10 ⁻⁶ g / cm ² · sec.

Example 4
In the case of only the diffusion film 1 of Example 1, the water permeation rate was 2.568 × 10 ⁻⁶ g / cm ² · sec. From this example, it can be said that the water permeation rate tends to be greater when woven fabric or the like is used.

(Comparative Example 1)
When montmorillonite, which is an inorganic water-absorbing agent, was used in place of the fine powder silica of Example 1, the water permeation rate was almost zero.

(Example 5)
A polyester non-woven fabric having a thickness of approximately 0.01 mm and a polyethylene net having a thickness of approximately 0.1 mm are applied to one side of the water diffusion membrane 1 having a thickness of 0.5 mm used in Example 1 and the other surface. The polyethylene side was further faced and further thermocompression bonded. From this, a strip with a width of 25 mm was cut out and the peel adhesion was measured. In this case, the material was destroyed at 5.8 kg.
On the other hand, the peel adhesive strength when not backed with a polyethylene net was 0.15 kg.

(Example 6)
The air was blown from the side of the cooling sheet produced in Example 1 to the evaporation surface with a personal computer blower having an outer frame length of 92 mm, a rotational speed of 2000 rpm, and an air blowing amount of 1.22 m ³ / min. The water permeation rate was 9.770 × 10 ⁻⁶ g / cm ² · sec at room temperature of 20 ° C. It has been found that evaporation is promoted by blowing air to the evaporation surface.

(Example 7)
The water diffusion membrane used in Example 1, polyethylene propylene dienemer rubber (trade name JSREP57C), fine powder silica (trade name Nipsil VN-3), and paraffinic oil have the same blending ratio and are water-soluble fungicides. 2-Mercaptopyridine N-oxide sodium (Wako Pure Chemical Industries, Ltd.), 2- (4-thiazolyl) benzimidazole (Tokyo Chemical Industry Co., Ltd.) or Hiba Oil, which is a water-insoluble fungicidal agent A water diffusion film having a thickness of 0.5 mm was prepared by adding 1% by mass (3.43 g) to the total weight.
And according to JIS Z 2911 (2010), the anti-mold property of each said water diffusion film was evaluated. The test environment was 26 ° C. and 95% RH or more, and the antifungal property was evaluated by visual observation after 4 weeks.
The results are shown in FIG.
From FIG. 4, it was shown that 2-mercaptopyridine N-oxide sodium provides the most fungicidal properties.

(Example 8)
The cooling performance between the cooling sheet and the commercial product A was compared by the following method.
First, 100 g of polyethylene propylene dienemer rubber (trade name JSREP57C) and 100 g of fine powder silica (trade name Nipsil VN-3) and 143 g of paraffinic oil are kneaded with two rolls, and then water diffusion using a calendar roll molding machine. A film was formed, and a 0.4 mm-thick laminated sheet was produced by pressing the film with a staple (staple fiber). And after attaching the water inlet made from a polypropylene to the center part of the said lamination sheet, the four sides of the 0.2 mm thick blue sheet (made from polyethylene) were bonded together using a 100 degreeC press, and the cooling sheet was produced.
Next, about 380 g of tap water having a water temperature of 19 ° C. was poured into the cooling sheet and sealed. Moreover, about 580g of tap water was inject | poured into the said commercial item A, and it sealed. These were placed on a 3 mm thick plywood in an environment of 30 ± 2 ° C. and 50 ± 5% RH, and the temperature change of the surface where the cooling sheet and the commercial product A were in contact was measured by thermography. Measurements were taken every 5 minutes until 30 minutes, and thereafter every 10 minutes.
The results are displayed in FIG.
FIG. 5 shows that the cooling sheet has a longer cooling effect than the commercial product A.
The initial temperature of the plywood surface was 30.8 ° C.

Example 9
The moisture permeability of the 0.23 mm-thick laminated sheet (water diffusion film + sufu) produced by the same method as in Example 8 and the 0.26 mm-thick polyurethane sheet cut out from the commercial product B were compared.
The experiment was performed as follows.
As shown in FIG. 6, after placing the electronic balance in a constant temperature bath at 35 ° C., the plastic cup was filled with 30 g of water, and the above laminated sheet (water diffusion membrane + sufu) and the above polyurethane sheet were used as samples. The cup was turned upside down with the lid on, and was placed so that the surface of each sheet did not touch the balance. In the case of a laminated sheet (water diffusion film + sufu), it was attached to a plastic cup so that when the cup was turned upside down, the water diffusion film side was in contact with water.
The change in weight due to the permeation of water through each sheet was automatically recorded using the interval recording function of the electronic balance.
The results are displayed in FIG.
FIG. 7 shows that the laminated sheet (water diffusion film + sufu) has a higher moisture permeability than the polyurethane sheet cut out from the commercial product B.

(Example 10)
A tube-shaped capillary with an inner diameter of 1 mm and an outer diameter of 2 mm was attached to a melt viscosity measuring apparatus (Capillograph 1C, manufactured by Toyo Seiki Seisakusho Co., Ltd.) to prepare a tube-shaped water diffusion cooling base material. The molding temperature was 90 ° C., and the extrusion speed was arbitrary.
As shown in FIG. 8, it was shown that the cooling water base for tubular water diffusion can be formed.

  In recent years, the global warming phenomenon has become remarkable, and the number of hot days in summer has been increasing. In order to surpass this intense heat, the use of electric power is increasing, and greenhouse gas emissions increase in proportion to it, falling into a social dilemma in which global warming proceeds. The cooling by the cooling sheet of the present invention is an energy-saving and resource-saving cooling method that does not emit greenhouse gases, and its practicality is remarkable.

  As a use of the cooling sheet of the second invention, cooling of a roof or a wall of a building is first considered. Specifically, it is cooling of the roof of a building, roofs and walls of ordinary dwellings, warehouses, simple temporary dwellings, roofs of simple tents, and roofs of various livestock sheds. There is also cooling of the roof of various transport vehicles such as cars and trains. Furthermore, since it is flexible and lightweight, it can be used for clothing-related applications such as work clothes, vests, and hats. In addition, it can be applied to cooling various instruments such as computers and personal computers.

1 Water diffusion membrane (base material of the first invention)
2 Canvas 3 Double-sided adhesive 4 Polyethylene capillary (outer diameter 3 mm)
5 Plug 6 Water chamber 10 Neck cooler 11 Neck cooler body 12 Cooling sheet

Claims (12)

All of the parts or portion of the circumference of the water chamber where the water is filled, consisting finely divided silica and cooling substrates for water diffusion blended with liquid softener having a specific surface area 150~380m 2 / ^g to high polymer water diffusion A cooling sheet comprising a film . The cooling sheet according to claim 1, wherein 30 to 150 parts of the fine powder silica and 50 to 200 parts of the liquid softening agent are used with respect to 100 parts by weight of the high molecular weight polymer. The cooling sheet according to claim 1, wherein the polymer is a nonpolar rubber. The cooling sheet according to any one of claims 1 to 3, wherein 70 to 120 parts of the fine powdered silica are used with respect to 100 parts by weight of the high-molecular polymer. The cooling sheet according to any one of claims 1 to 3, wherein the liquid softening agent is used in an amount of 70 to 170 parts by weight based on 100 parts of the polymer. The cooling sheet according to any one of claims 1 to 5 , wherein the water diffusion film is lined with a cloth. The cooling sheet according to any one of claims 1 to 6, wherein a surface of the water diffusion membrane that contacts water in the water chamber is lined with a porous sheet of a polymer that melts at a temperature of 300 ° C or lower. The cooling sheet according to any one of claims 1 to 7, wherein the water chamber has a structure in which a part of the periphery of the water chamber is covered with a water-impermeable film. The cooling sheet according to claim 8 , wherein the water-impermeable membrane is a polyethylene film. The cooling sheet according to claim 8 , wherein the water-impermeable film is a polyvinyl chloride film. The cooling sheet according to any one of claims 1 to 5, wherein a device for blowing air on the surface is attached. Neck Cooler, characterized in that claims 1 to 11 cooling sheets as claimed in any one is constituted by removably inserted.